Tucky



(No Model.) A. J. HODGSON.

STEAM BOILER FURNACE.

No. 522,059. Patented June Z6, 1894.

El 4 y i AQQ .7- y c I I I} J Z l, 1:;

y" i a 41 I i I/i/hzzesses f fm E'muP k v g UNrTED STATES PATENT Fries.

ALBERT J. I-IODGSON, OF PALMYRA, WISCONSIN, ASSIGNOR OF TWO-THIRDS TO REES W. DUGAN AND BRADFORD SHINKLE, OF OOVINGTON, KEN- TUOKY.

- STEAM-BOl'LER-FURNACE.

SPECIFICATION forming part of, Letters Patent No. 522,059, dated June26, 1894. Application filed January 20, 1894. Serialllo. 497,475- (No model.

To all whom it may concern.-

l 3e it known that I, ALBERT J. HODGSON, a citizen of the United States, and a resident of Palmyra, in the county of Jefferson and State of Wisconsin, have invented certain new and useful Improvements in Steam-Boiler Furnaces of which the following is a specification.

My lnvention relates to an improved statlonery boiler furnace for burning locomotive sparks or other low grade of fuel that it has been found impracticable to burn successfully in furnaces of ordinary construction.

To this end my invention consists in providing a furnace closed against the admission of air except through a blast pipe discharging under the grate bars, in providing means to keep the grate bars free from clinkers and to provide for cleansing the ash pit without necessitating the opening of the front of the furnace.

The invention will be first fully described in connection with the accompanying draw-' ings and then particularly referred to and polnted out in the claims.

Referring to the drawings, in which likeparts are represented by similar reference letters wherever they occur throughout the various views: Figure 1 is a longitudinal vertical section of a steam boiler furnace constructed according to my invention. Fig. 2 is a, horizontal section of the same taken through line 00 a: of Fig. 1. I

The side and rear walls of the furnace may be constructed in any approved manner and the furnace A and the boiler B supported therein in the usual manner. The bridge wall A has its forward end sloping down at an angle from the passage between the boiler and bridge wall and the ash pit C.

D is a water pipe perforated on the under side and extending across the sloping front of the bridge wall underneath the grate bars E,

pipe leading from the bottom of the pit, so

that it is rarely necessary to open the front sliding doors 0 of the ash pit.

The essential feature of the invention is to keep the ash pit and the-space underneath the grate bars closed to the admission of air except through the blast pipejl, which exorslotted upon the upper side to force the blast of air through a blower (not shown) directly up and through the spaces between the grate bars, the air being partially heated in its passage through the pipe F and its branch F.

To free the grate bars from clinkers,I have provided a transverse rock shaft G, which is journaled in bearings fixed in the sides of the furnace walls. On this shaft are fixed collars g, which carry blades g projecting alternately from opposite sides of the shaft and arranged to pass up through the openings between the grate bars when the shaft is rocked by the rod H, which is connected to the downwardly projecting arm 9 which arm is secured to the shaft. The end of the rod is provided with a handle it for the purpose of rocking the shaft by operating the rod back and forth, but in place of this arrangement one end of the shaft may extend through the side of the furnace and be provided with a crank arm. In operation theblades g throw the clinkers loose from the gratebars and can be readily removed from the front of the furnace by the ordinary fire hook.

One great difficulty in all previous attempts to burn locomotive sparks was caused by the sparks clinking in flat sheets over the grate bars and obstructing the passage of air through the fuel. bars are kept free allowing the air to pass up through the incandescent fuel upon the bars and causing perfect combustion.

In practice, I have found that the furnace as shown completely consumes the locomotive sparks without producing smoke, but if thefire has to be forced, a branch of the pipe F might extend up through the bridge wall so as to supply the heated products of combustion, which pass over thebridge wall, with a supply of oxygen to produce perfect combustion. The uptake may also be provided, if

necessarygwith regulating dampers and the By this means the grate fuel for the furnace is supplied in the usual way, through the fire doors, or may be fed by a mechanical stoker or hopper.

It is obvious that many mere mechanical changes may be made in the structure without departing from the spirit or scope of my invention, and, without limiting myself to the specific features shown and described, what I claim is-- 1. In a steam boiler furnace, the combination of the grate bars, the closed chamber underneath the grate bars, the ash pit in front of said chamber, the bridge wall inclined from the rear of the grate bars forward to the ash pit, and the blast pipe for delivering air under pressure into said chamber, substantially as shown and described.

2. The combination of the grate bars, the closed chamber underneath said bars, the bridge wall having inclined front, the ash pit below the inclined front of the bridge wall, the water pipe discharging over said inclined front, the discharge pipe leading from the ash pit, and the blast pipe to deliver air under pressure below the grate bars.

3. In a steam boiler furnace, the combination of the grate bars, the closed chamber below said bars, the blast pipe to deliver air,

under pressure, into said chamber, and a transverse shaft provided with blades to pass between the grate bars when the shaft is retated or vibrated for the purpose of freeing said bars from clinkers, substantially as shown and described.

4. In a steam boiler furnace, the combination of the inclined bridge wall, the grate bars resting thereon and on the front of the furnace, the closed chamber underneath the grate bars, a perforated water pipe crossing the inclined front of the bridge wall near the grate bars, the ash pit 0 having a discharge pipe leading from it, through which the ashes are carried by the flow of water from said water pipe, the blast pipe F leading from the rear of the furnace through the bridge wall and connected to the transverse perforated branch F for discharging air under pressure into the inclosed chamber, the 'rock shaft Gr having blades g arranged thereon to pass between the grate bars, the arm g the rod 11 to rock said shaft substantially as and for the purpose set forth.

ALBERT J. HODGSON. IVitnesses:

LEWIS P. MATTHEWS, WM. BILTOLIFFE. 

